There used to be a bunch of rock chucksin the area around the I-15 exit to Lava Hot Springs. (I guess it's called Indian Rocks State Park now). I haven't been over there in a while, but I can't imagine anybody farming that lava rock. Lots of coyotes and cats in there, too.
You ever checked that out? Watch for snakes.
I don't think I ever saw a prairie dog in Idaho in 18 years of living there.